Task 5. Fill in the blanks using (NOT) HAVE TO / MUST (NOT) / CAN / COULD:

George has traveled a lot. He ……………………… speak four languages.
I can’t sing now but I ………………….. sing very well when I was a child.
She will stay in bed till 10 o’clock this morning. Because she ………………………….. go to work.
Many students in Turkey ………………………… wear uniform when they go to school.
I’m sorry I couldn’t come yesterday. I ……………………….. work late.
You’ve been coughing a lot recently. You ……………………….. smoke so much.
You have a bad headache. So you ………………………. go to bed early.
I can’t swim very far these days but ten years ago I ………………………. swim from one side of the lake to the other.
You ……………….. see the sea from our bedroom window.
10. It isn’t permitted to speak Turkish during the lessons. So you …………………… speak Turkish.